查询词典 have trouble doing sth.

Be busy doing, keep busy doing sth.

忙于做某事。

It 's worthwhile doing be worth doing sth.

这问题不值得反复讨论。

Keep on doing=go on doing sth.

继续做某事

Go on doing, go on to do, go on with, continue go on doing sth.

指继续做同一件事。

Keep on, go on, continue with, keep on doing,go on doing, cotinue with sth.

则表示"做好了一件事，紧接着去做另一件事"。

If you insist doing sth then keep doing it.

如果你希望坚持做某件事，那就坚持每天做。

Keep doing/ keep on doing sth.

继续做某事，不停的做某事如

Keep on doing sth: continue doing 例如:He kept on studying English for his whole life.

right在这一句中是个副词，表示"一直"。

Keep on doing "继续做" keep from doing sth.

阻止做某事不能省略from

Set out to do=set about doing=start doing/to do sth.

开始着手做某事。

He paid $5,000 for this cupcake.

他我这个纸杯蛋糕花了5000美元。

I mean, if you want to, that is

我的意思是，如果你们想吃的话。